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Composites - polymer matrix composites (PMCs)
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Composites - polymer matrix composites (PMCs)
Very common - polyesters, vinyl esters
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Composites Role of matrix in FR composites: a. transfer stresses betwn fibers b. provide barrier to environment c. protect fibers Matrix/fiber bond: matrix must wet fiber physical & chemical bond desirable mechanical interlocking Fibers frequently coated w/ coupling agent
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Composites non-coupled coupled
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Composites Fibers - variables amount fiber length distribution orientation
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Composites Fibers - variables amount fiber length distribution orientation Fiber orientation can be random aligned intermediate
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Composites
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Composites
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Materials selection - some considerations
Economics Environmental Political Market Aesthetics Material properties
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Materials selection - material cost
Relative cost - compared to that of hot rolled ASTM A36 plate (0.29C-1Mn-0.28Si) (unit wt. basis)
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Materials selection - environmental
Health hazards Recycling when drawing SS to rod need lubricant Metals particularly suited to recycling - can be easily sorted, remelted, & shaped Ceramics usually not recycled - many polymers are Composites difficult to recycle - difficult to separate fibers from matrix
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Materials selection - political
Who writes the specs for contract bids? Will they specify stainless steel rebar in roads & bridges?
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Materials selection - market
Carrera GT vs …… Kia vs ……
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Materials selection - aesthetics
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Materials selection - properties
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Materials selection - properties
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Materials selection - properties
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Materials selection - properties
500 MPa
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Materials selection - properties
500 MPa
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